CN111577871A - Variable stiffness buffer energy-absorbing ring for EPS reducer and its processing technology - Google Patents

Abstract

The invention relates to a variable stiffness buffer energy-absorbing ring for an EPS reducer and a processing technology thereof, belonging to the technical field of EPS reducers. The sleeve meshes with the output shaft that extends out of the end face of the reducer housing. The lower end of the worm gear is provided with a worm gear that is geared to the worm gear for transmission. The outer end is provided with a motor housing that is sleeved with the motor output shaft and flanged to the reducer housing. A main bearing is arranged between the worm and the motor housing, and the main bearing is connected to the motor housing. There is a retaining ring nested with the worm to limit the position, and both ends of the main bearing are provided with an energy-absorbing buffer ring that is nested and connected with the retaining ring and the worm. It has the characteristics of compact structure, good running stability, good shock absorption and noise reduction and long service life. Solved the problem of noise caused by metal impact. Avoid the impact of the impact to accelerate the wear of the worm.

Description

Variable stiffness buffer energy-absorbing ring for EPS reducer and its processing technology

technical field

The invention relates to the technical field of EPS reducers, in particular to a variable stiffness buffer energy-absorbing ring for EPS reducers and a processing technology thereof.

Background technique

At present, the buffer energy-absorbing ring used in EPS reducers has the following problems: the structure of the buffer energy-absorbing ring is mostly a rubber ring in the middle, and there are metal gaskets on both sides. According to the elastic deformation of the rubber, only a simple linear suction capacity can be produced, which is inconsistent with the actual complex working conditions of the automobile, the energy absorption effect is not ideal, and vibration noise often occurs; secondly, when the worm bearing moves along the axial direction with the vibration of the body , collides with the shaft stop step or the stop ring of the worm, and generates metal impact noise. The current buffer energy-absorbing ring cannot avoid the generation of this noise.

SUMMARY OF THE INVENTION

The invention mainly solves the problems of poor running stability, large impact noise and short service life in the prior art, and provides a variable-stiffness buffer energy-absorbing ring for an EPS reducer and a processing technology thereof, which has the advantages of compact structure, good running stability, The characteristics of good shock absorption and noise reduction and long service life. Solved the problem of noise caused by metal impact. Avoid the impact of the impact to accelerate the wear of the worm.

The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions:

A variable stiffness buffer energy-absorbing ring for an EPS reducer, comprising a reducer casing, a worm gear is arranged in the reducer casing, and the worm gear is provided with a tooth-shaped nesting meshing with the worm gear and extends out of the reducer casing. The output shaft of the end face of the body, the lower end of the worm wheel is provided with a worm gear that is geared to the worm gear, and one end of the worm is provided with a motor output shaft that is limited by a spline-type circlip in phase with the worm, and the motor output The outer end of the shaft is provided with a motor housing that is bushed with the motor output shaft and connected to the reducer housing by flanged bolts. The main bearing, between the main bearing and the motor housing, is provided with a retaining ring that is nested and limited with the worm, and both ends of the main bearing are provided with energy-absorbing buffer rings that are nested and connected to the retaining ring and the worm. .

Preferably, the energy-absorbing buffer ring includes a rubber ring assembly, and both ends of the rubber ring assembly are provided with metal backing rings nested with the rubber ring assembly.

Preferably, the rubber ring assembly includes a rubber ring body, the outer ring end surface of the rubber ring body is provided with a buffer energy-absorbing ring groove integrated with the rubber ring body, and one end of the rubber ring body is provided with The rubber ring body is an integrated limiting convex ring.

Preferably, a compression spring sleeved with the worm is provided between the output shaft of the motor and the worm.

Preferably, an auxiliary bearing sleeved with the worm is arranged between the other end of the worm and the reducer housing, a worm bushing is arranged between the auxiliary bearing and the worm, and the auxiliary bearing is connected to the reducer housing. There is a bearing holder between them.

Preferably, between the bearing fixing seat and the reducer housing, there is an adjusting spring that is sleeved with the bearing fixing seat to limit the position.

When the EPS does not turn, the worm is not subject to axial force, and the two energy-absorbing rings on both sides of the main bearing are only subjected to the pre-pressure during the assembly process, and the energy-absorbing rings remain in their original state.

When the EPS steering angle is small or the road conditions are flat, the worm is subjected to a small axial force, the energy-absorbing ring is compressed and deformed, the shape of the buffer energy-absorbing ring groove changes, and the rubber ring assembly generates approximately linear energy-absorbing resistance for buffering the worm. The axial force can achieve the purpose of shock absorption and elimination of abnormal noise.

When the EPS steering angle is large or the road conditions are bumpy, the worm is subjected to a large axial force, the energy-absorbing ring is compressed and deformed by the force, and the shape of the buffer energy-absorbing ring groove changes completely and disappears, and it is formed into a non-buffer energy-absorbing ring groove. At this time, the stiffness of the energy-absorbing ring increases instantaneously, forming a nonlinear stiffness. Therefore, the energy absorption resistance is rapidly increased, and the effect of better shock absorption and elimination of abnormal noise is achieved.

Preferably, the processing technology of the variable-stiffness buffer energy-absorbing ring for the EPS reducer includes the following operation steps:

Step 1: Place metal backing rings in the magnetic positioning rings of the upper and lower templates.

Step 2: After the metal backing ring is placed, the lower pressure cylinder of the upper die at the lower end of the injection molding machine frame drives the upper die plate to move down along the die guide rod to close the die with the lower die plate.

Step 3: After the mold is closed, the oil inlet valve is opened to drive the injection pressing cylinder assembly to press down, so that the injection pressing cylinder assembly, the upper template and the lower template form the injection cavity of the rubber ring assembly.

Step 4: Then the rubber liquid feed valve is opened to carry out the injection molding process of the rubber ring assembly. When the injection cavity is full, the injection molding and pressing oil cylinder assembly and the upper mold and lower pressure oil cylinder keep the pressure, the lifting oil cylinder lifts the bottom platen, and at the same time the hot steam The shaft is heated by steam to complete the extrusion injection molding of the rubber ring assembly.

Preferably, the upper end of the injection molding machine frame is provided with a hydraulic control valve block that controls the oil inlet valve, the rubber liquid inlet valve and the pipeline of the injection pressing oil cylinder assembly. The hydraulic control valve block plays the role of cavity communication and pressure maintenance.

Preferably, the injection-compression cylinder assembly drives the injection-compression piston rod to perform a lifting process through the communication between the compression cylinder and the oil inlet valve.

Preferably, the injection molding channel in the injection molding compression piston rod is communicated with the rubber liquid feed valve and the injection molding cavity, and injection molding is performed by applying a pressure of 1.2 Mpa to 1.7 Mpa to the rubber liquid.

The present invention can achieve the following effects:

The invention provides a variable-stiffness buffer energy-absorbing ring for an EPS reducer and a processing technology thereof. Compared with the prior art, the invention has the characteristics of compact structure, good running stability, good shock absorption and noise reduction effect and long service life. Solved the problem of noise caused by metal impact. Avoid the impact of the impact to accelerate the wear of the worm.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

FIG. 2 is a cross-sectional view of the structure of the energy absorbing ring of the present invention.

3 is a structural cross-sectional view of the rubber ring assembly of the present invention.

4 is a structural cross-sectional view of the injection extrusion molding mechanism of the energy absorbing ring of the present invention.

FIG. 5 is a structural cross-sectional view of the injection-pressing oil cylinder of the present invention.

In the figure: reducer housing 1, output shaft 2, worm gear 3, worm 4, main bearing 5, energy-absorbing buffer ring 6, retaining ring 7, motor housing 8, motor output shaft 9, compression spring 10, worm Bushing 11, auxiliary bearing 12, bearing fixing seat 13, adjusting spring 14, metal backing ring 15, rubber ring assembly 16, limiting convex ring 17, buffer energy absorbing ring groove 18, rubber ring body 19, injection molding machine Frame 20, hydraulic control valve block 21, oil inlet valve 22, rubber liquid inlet valve 23, injection pressing cylinder assembly 24, upper die lower pressure cylinder 25, die guide rod 26, upper template 27, magnetic positioning ring 28 , the hot steam tunnel 29, the bottom pressure plate 30, the lifting cylinder 31, the lower template 32, the compression cylinder 33, the injection molding piston rod 34, and the injection molding tunnel 35.

Detailed ways

The technical solutions of the invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Example: As shown in Figures 1-5, a variable stiffness buffer energy-absorbing ring for an EPS reducer includes a reducer housing 1, and a worm gear 3 is arranged in the reducer housing 1, and the worm gear 3 is provided with a worm gear 3. The output shaft 2 that meshes with the teeth and extends out of the end face of the reducer housing 1, the lower end of the worm wheel 3 is provided with a worm 4 that is in tooth-shaped meshing transmission with the worm wheel 3, and one end of the worm 4 is provided with a spline type circlip that is in phase with the worm 4. The limited motor output shaft 9 is provided with a compression spring 10 sleeved with the worm 4 between the motor output shaft 9 and the worm 4 . An auxiliary bearing 12 sleeved with the worm 4 is provided between the other end of the worm 4 and the reducer housing 1 , a worm bushing 11 is arranged between the auxiliary bearing 12 and the worm 4 , and a worm bush 11 is arranged between the auxiliary bearing 12 and the reducer housing 1 . Bearing holder 13 . Between the bearing fixing base 13 and the reducer housing 1, there is an adjusting spring 14 sleeved with the bearing fixing base 13 to limit the position. The outer end of the motor output shaft 9 is provided with a motor housing 8 which is bearing-type socket connection with the motor output shaft 9 and flange-type bolted connection with the reducer housing 1 phase. The main bearing 5 is nested with the worm 4. Between the main bearing 5 and the motor housing 8, there is a retaining ring 7 that is nested with the worm 4 to limit the position. The two ends of the main bearing 5 are provided with the retaining ring 7 and the worm 4. Nested connection of energy-absorbing buffer rings 6. The energy-absorbing buffer ring 6 includes a rubber ring assembly 16, and the rubber ring assembly 16 includes a rubber ring body 19. The outer ring end surface of the rubber ring body 19 is provided with a buffer energy-absorbing ring groove 18 integrated with the rubber ring body 19. The rubber ring body 19 One end of the rubber ring is provided with a limiting convex ring 17 integrated with the rubber ring body 19 . Both ends of the rubber ring assembly 16 are provided with metal backing rings 15 nested with the rubber ring assembly 16 .

The processing technology of variable stiffness buffer energy-absorbing ring for EPS reducer includes the following steps:

Step 1: Place the metal backing rings 15 in the magnetic positioning rings 28 of the upper template 27 and the lower template 32 .

Step 2: After the metal backing ring 15 is placed, the upper die lowering cylinder 25 at the lower end of the injection molding machine frame 20 drives the upper die plate 27 to move downward along the die guide rod 26 to mold with the lower die plate 32.

The third step: after the mold is closed, the oil inlet valve 22 is opened to drive the injection pressing cylinder assembly 24 to press down, and the injection pressing cylinder assembly 24 communicates with the oil inlet valve 22 through the pressing cylinder 33 to drive the injection pressing piston rod 24 to move up and down process. The injection-pressing cylinder assembly 24 , the upper template 27 and the lower template 32 form an injection cavity for the rubber ring assembly 16 .

Step 4: Then the rubber liquid feed valve 23 is opened to carry out the injection molding process of the rubber ring assembly 16, and the injection molding shaft 35 in the injection pressing piston rod 34 is communicated with the rubber liquid feed valve 23 and the injection cavity. 1.5Mpa pressure for injection molding. When the injection cavity is filled, the injection pressing cylinder assembly 24 and the upper mold lowering cylinder 25 maintain pressure, the lifting cylinder 31 lifts the bottom pressure plate 30, and the hot steam tunnel 29 is heated by steam to complete the extrusion injection of the rubber ring assembly 16. forming.

The upper end of the injection molding machine frame 20 is provided with a hydraulic control valve block 21 that controls the oil inlet valve 22 , the rubber liquid inlet valve 23 and the injection pressing oil cylinder assembly 24 in pipeline communication.

To sum up, the variable stiffness buffer energy-absorbing ring and its processing technology for the EPS reducer have the characteristics of compact structure, good running stability, good shock absorption and noise reduction effect and long service life. Solved the problem of noise caused by metal impact. Avoid the impact of the impact to accelerate the wear of the worm.

The above are only specific embodiments of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the field of the present invention are all covered by the patent scope of the present invention. among.

Claims (10)

1. A variable stiffness buffer energy-absorbing ring for an EPS reducer, characterized in that it comprises a reducer housing (1), and a worm gear (3) is provided in the described reducer housing (1), and the worm gear ( 3) There is an output shaft (2) that meshes with the worm gear (3) in a toothed shape and extends out of the end face of the reducer housing (1). The lower end of the worm gear (3) is provided with A worm (4) with toothed meshing transmission, one end of the worm (4) is provided with a motor output shaft (9) that is limited by a spline-type circlip with the worm (4), and the motor output shaft (9) The outer end is provided with a motor housing (8) that is bearing-type socket connection with the motor output shaft (9) and flange-type bolted connection with the reducer housing (1). The worm (4) is connected to the motor. A main bearing (5) nested with the worm (4) is arranged between the housings (8), and the main bearing (5) and the motor housing (8) are arranged with the worm (4) nested The retaining ring (7) is limited, and the two ends of the main bearing (5) are provided with energy-absorbing buffer rings (6) which are nested and connected with the retaining ring (7) and the worm (4). 2. The variable stiffness buffer energy-absorbing ring for EPS reducer according to claim 1, characterized in that: the energy-absorbing buffer ring (6) comprises a rubber ring assembly (16), and the rubber ring assembly (16) Both ends are provided with metal backing rings (15) nested with the rubber ring assembly (16). 3. The variable-stiffness buffer energy-absorbing ring for EPS reducer according to claim 2, characterized in that: the rubber ring assembly (16) comprises a rubber ring body (19), and the rubber ring body (19) is outside the The end face of the ring is provided with a buffer energy-absorbing ring groove (18) integrated with the rubber ring body (19), and one end of the rubber ring body (19) is provided with a limiter integrated with the rubber ring body (19). convex ring (17). 4. The variable-stiffness buffer energy-absorbing ring for EPS reducer according to claim 1, characterized in that: between the motor output shaft (9) and the worm (4), there is a presser sleeved with the worm (4). Tighten spring (10). 5. The variable stiffness buffer energy-absorbing ring for EPS reducer according to claim 1, characterized in that: the other end of the worm (4) and the reducer housing (1) are provided with a sleeve for the worm (4) A worm bushing (11) is arranged between the auxiliary bearing (12) and the worm (4), and a worm bushing (11) is arranged between the auxiliary bearing (12) and the reducer housing (1). Bearing retainer (13). 6. The variable-stiffness buffer energy-absorbing ring for EPS reducer according to claim 5, characterized in that: between the bearing fixing seat (13) and the reducer housing (1), there is a bearing fixing seat (13) The adjusting spring (14) of the limit socket is connected with each other. 7. The processing technology of the variable stiffness buffer energy-absorbing ring for EPS reducer according to claim 1, is characterized in that comprising the following operation steps: Step 1: Place metal backing rings (15) in the magnetic positioning rings (28) of the upper template (27) and the lower template (32); Step 2: After the metal backing ring (15) is placed, the upper die lowering cylinder (25) at the lower end of the injection molding machine frame (20) drives the upper die plate (27) downward along the die guide rod (26). The movement is closed with the lower template (32); The third step: after the mold is closed, the oil inlet valve (22) is opened to drive the injection pressing cylinder assembly (24) to press down, so that the injection pressing cylinder assembly (24), the upper template (27) and the lower template (32) are formed the injection cavity of the rubber ring assembly (16); Step 4: Then the rubber liquid feed valve (23) is opened to carry out the injection molding process of the rubber ring assembly (16). pressure, the lifting cylinder (31) lifts the bottom platen (30), and at the same time the hot steam tunnel (29) is heated by steam to complete the extrusion and injection molding of the rubber ring assembly (16). 8. The processing technology of the variable stiffness buffer energy-absorbing ring for EPS reducer according to claim 7, characterized in that: the upper end of the injection molding machine frame (20) is provided with a control oil inlet valve (22), a rubber liquid inlet The hydraulic control valve block (21) in which the material valve (23) is connected with the pipeline of the injection pressing oil cylinder assembly (24). 9 . The processing technology of the variable stiffness buffer energy-absorbing ring for EPS reducer according to claim 8, characterized in that: the injection-molding pressing oil cylinder assembly (24) is connected and driven with the oil inlet valve (22) through the pressing oil cylinder (33) Injection press the piston rod (24) to perform the lifting process. 10. The processing technology of the variable-stiffness buffer energy-absorbing ring for EPS reducer according to claim 8, characterized in that: the injection-molding tunnel (35) and the rubber liquid feed valve (23) in the injection-compressed piston rod (34) , The injection cavity is connected, and injection is carried out by applying a pressure of 1.2Mpa to 1.7Mpa to the rubber liquid.

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